As of the census of 2010, there were 20,837 people, 6,601 households, and 5,114 families residing in the city. The population density was 1,002.1 people per square mile (387.0/km²). There were 7,260 housing units at an average density of 312.0 per square mile (120.5/km²). The racial makeup of the city was 71.7% White, .4% Black or African American, 0..7% Native American, 0..6% Asian, , 24.3% from other races, and 2.4% from two or more races. 95% of the population were Hispanic or Latino of any race.
There were 6,601 households out of which 48.1% had children under the age of 18 living with them, 47.9% were married couples living together, 24.2% had a female householder with no husband present, and 22.5% were non-families. 20.3% of all households were made up of individuals and 32.2% had someone living alone who was 65 years of age or older. The average household size was 3.12 and the average family size was 3.62.
In the city, the population was spread out with 31.8% under the age of 18, 11.3% from 20 to 29, 10.3% from 30 to 39, 12% from 40 to 49, 11.1% from 50 to 59, 5.3% from 60 to 64, and 13.8% who were 65 years of age or older. The median age was 34 years. For every 100 females there were 85.1 males. For every 100 females age 18 and over, there were 78.5 males.
The median income for a household in the city was $26,333, and the median income for a family was $32,927. Males had a median income of $32,100 versus $22,823 for females. The per capita income for the city was $13,980. About 30.8% of families and 35.9% of the population were below the poverty line, including 50.3% of those under age 18 and 30.7% of those age 65 or over.
Source 2010 census (demographics) and 2009-2013 5-year American Community Survey (income and poverty numbers).
Learn more about how new jobs are being created in Nogales, Arizona, at the Nogales Community Development website.